206212857511 has 4 divisors (see below), whose sum is σ = 208529856000. Its totient is φ = 203895859024.

The previous prime is 206212857457. The next prime is 206212857517. The reversal of 206212857511 is 115758212602.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 206212857511 - 2²³ = 206204468903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206212857517) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1158499111 + ... + 1158499288.

It is an arithmetic number, because the mean of its divisors is an integer number (52132464000).

Almost surely, 2^206212857511 is an apocalyptic number.

206212857511 is a deficient number, since it is larger than the sum of its proper divisors (2316998489).

206212857511 is an equidigital number, since it uses as much as digits as its factorization.

206212857511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2316998488.

The product of its (nonzero) digits is 67200, while the sum is 40.

The spelling of 206212857511 in words is "two hundred six billion, two hundred twelve million, eight hundred fifty-seven thousand, five hundred eleven".